service.js
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'use strict'
var os = require('os')
var util = require('util')
var EventEmitter = require('events').EventEmitter
var serviceName = require('multicast-dns-service-types')
var txt = require('dns-txt')()
var TLD = '.local'
module.exports = Service
util.inherits(Service, EventEmitter)
function Service (opts) {
if (!opts.name) throw new Error('Required name not given')
if (!opts.type) throw new Error('Required type not given')
if (!opts.port) throw new Error('Required port not given')
this.name = opts.name
this.protocol = opts.protocol || 'tcp'
this.type = serviceName.stringify(opts.type, this.protocol)
this.host = opts.host || os.hostname()
this.port = opts.port
this.fqdn = this.name + '.' + this.type + TLD
this.subtypes = opts.subtypes || null
this.txt = opts.txt || null
this.published = false
this._activated = false // indicates intent - true: starting/started, false: stopping/stopped
}
Service.prototype._records = function () {
var records = [rr_ptr(this), rr_srv(this), rr_txt(this)]
var self = this
var interfaces = os.networkInterfaces()
Object.keys(interfaces).forEach(function (name) {
interfaces[name].forEach(function (addr) {
if (addr.internal) return
if (addr.family === 'IPv4') {
records.push(rr_a(self, addr.address))
} else {
records.push(rr_aaaa(self, addr.address))
}
})
})
return records
}
function rr_ptr (service) {
return {
name: service.type + TLD,
type: 'PTR',
ttl: 28800,
data: service.fqdn
}
}
function rr_srv (service) {
return {
name: service.fqdn,
type: 'SRV',
ttl: 120,
data: {
port: service.port,
target: service.host
}
}
}
function rr_txt (service) {
return {
name: service.fqdn,
type: 'TXT',
ttl: 4500,
data: txt.encode(service.txt)
}
}
function rr_a (service, ip) {
return {
name: service.host,
type: 'A',
ttl: 120,
data: ip
}
}
function rr_aaaa (service, ip) {
return {
name: service.host,
type: 'AAAA',
ttl: 120,
data: ip
}
}